Yes. That ACR product combined a mirror and a whistle - too bad ACR didn't figure out how to combine a signal mirror with their PLB.

Their signal mirror also had great documentation on the back of the mirror.

ACR actually produced a combination survival product for the Gemini and Apollo astronauts in the 1960s that included a flip-out signal mirror with a retroreflective mesh aimer.

Yes, assuming they haven't changed from those I bought over a decade ago[1] (and they do look the same).

They seemed okay as mirrors, but as signal mirrors, I couldn't figure out how to use their red cross & dot for accurate sighting - they didn't seem to do anything useful.

Has anyone had any luck figuring out how to get value out of the CountyComm red cross & dot?

If not, I'd just tape on my own DIY "red-dot" retroreflective signal mirror sight made from red "truck tape"[2] that we've been using for our Operation On Target long distance peak to peak signal mirror event since 2009 - I know those work extremely well, though they can't handle a water dunking.

The advantage of starting with the CountyComm mirror is that they start with a quality mirror, and they've already removed the reflective surface in the center, creating a transparent window. Those are the first two steps when I make a signal mirror from scratch[2], so it is a labor saving - plus they have the lanyard. It's just that their aimer (as far as I can seen) is not greatly helpful.

I just ordered a pair of the CountyComm mirrors (one of each size) just now so I can take another look, but my expectations are low.

[1] These look identical to those they've been selling for over a dozen years - see:
https://www.youtube.com/watch?v=PGq4oKZ0bPA

[2] https://www.youtube.com/watch?v=4aNiJ7fWb9g[i][/i][color:#3333FF][/color]